Device having wear-resistant surface



July 1-, 1930. 1.. J.IOLLESHEIMER 1,769,160

DEVICE HAVING WEAR RESISTANT SURFACE Filed Deb. 21, 1927 Ill A TTORNEYS Patented July 1, 1930 UNITED STATES PATENT orr1'e-E LAWRENCE J. OLLESHEIM ER, OF WEST ORANGE, NEW JERSEY DEVICE HAVING WEAR-RESISTANT SURFACE Application filed December 21, 1927. Serial No. 241,715.

This invention relates to devices having scription of a certain preferred embodiment wear-resistant surfaces, and more particularthereof, as illustrated in the accompanying ly to crown pulleys constituted of fibrous drawings, in which Fig. l is an elevational material. View of a crown pulley embodying my inven- 5 An object of the present invention is to protion; and Fig. 2 is a sectional view of the vide a pulley whose constitution is such that pulley illustrated in Fig. 1 showing the inthe driving face of the pulley wears substanternal construction thereof. tially evenly without any material change in Referring to the drawings, the numerall the surface contour. generally designates a crown pulley embody- 10 A further object of the invention is to proing my invention. In fabricating the crown vide a crown pulley having such a construcpulley, a multiplicity of sections of material tion that the crown of the pulley is always having varying characteristics are preferably preserved and maintained in spite of the ac used. The number and kind of sections used centuated wear to which the crown is submay vary depending on the particular condijected in excess of the wear on the outer portions and circumstances, but in the present intions of the pulley. I stance, a pulley is shown as constituted of My invention comprises, generally speakthree sections or laminae 2,3, and 4, which are I ing, in fabricating a pulley of a plurality of firmly united and secured together. Sections elements having different characteristics with 2 and a are made of similar material and con- 20 respect to the rate of wear, and inarranging struction and constitute the outer portions of the elements in such a manner as to position the pulley, whereas section 3 is made of a those elements having the lowest rate of different material and construction than secwear, i. e., the most durable, at the portion or tions 2 and 4 and constitutes the central or portions of the pulley subject to the greatest crown portion of the pulley. Any well known 25 wear, and the elements having the highest method may be employed'to secure'the secrate of wear, i. e. less durable than the aforetions or laminae to each other,'but I prefer to said portion, at the portion or portions of the unite the various sections togetherby surfacpulley subjected to the least wear. By incoring them with a binder and then subjecting porating the principles of my invention in any them to hydraulic pressure for a suitable peri- 39 type of pulley, I give the latter such a constiod of time.- In this manner a laminated pulley 8O tution that even under the most adverse cirembodying my invention may be easily, cumstanccs of operation, as where abrasive economically, 7nd conveniently manufacdust comes into contact with the pulley, all tured on a commercial scale. portions wear away at such rates that the gen- The selection of the material and the type eral contour of the face of the pulley remains of construction of the individual elements unchanged. This preservation of surface depends on the particular conditions and circontour is brought about by the fact that alcumstances. In the case of crown pulleys, though the pulley wears away fastest at cerfor example, I have found that composite tain portions, the latter are constituted of lumber made in accordance with the Patent 40 more resistant material than the portions not No. 1,465,388,- issued' to Walsh and Watts on subjected to accentuated wear, thus the sur- August 21, 1923, is a satisfactory material. face of the pulley as a whole wears away sub- Lumber of this type which has been comstantially evenly. In the aforesaid manner pressed to about 50% to 60% of its original I can select materials having proper and apthickness may be employed for the central or propriate characteristics for the function that crown portion 3 of the illustrated pulley and they are to perform and then arrange these lumber compressed to about 70% of its origmaterials in a pulley so as to preserve any in'a'l-thiekness" for the outer portions? and 4. desired shape. Crowns made in the aforesaid manner are The invention as well as features and adhard and resistant and wear away very-much vantages thereof will be made clear by a demore slowly than the less resistant outer pertions of the pulley. By constructing pulleys in the aforesaid manner, it is possible to produce a crown pulley which will retain throughout the useful life thereof its original, general form and particularly its crown.

The pulley 1 is provided in the usual manner with a metal hub 5 of any appropriate type which has a standard keyway 6 incorporated therein. Projecting into the keyway are set screws 7 which are intended to hold a key in position when the pulley is mounted on a shaft. These screws can be inserted through holes 8 extending through the wooden pulley and the wall of the metal hub. As is well understood, these screws are removed when putting the pulley on a shaft and inserting a key to lock the pulley to the shaft. After the pulley and hey are in posi-- tion, the set screws are screwed in holes 8 so that they abut and make a holding contact with the key. I

When using my improved pulley it tends to wear away like any other pulley made of fibrous material or any other material, but due to the fact that the central portion of my pulley is harder than the outer portions, it wears away at a lower rate than the outer portions. Due to the aforesaid difference in the wearing rates of the central and outer portions, the crown as well as the general contour of the face of the pulley is maintained and preserved.

It is to be noted that although the invention has been described with particular reference to pulleys, the principles of my invention may be incorporated in any device having a wear-resistant surface which is subject to varying degrees of wear at different portions of the s rface.

It is to be observed that my invention may be incorporated in any type of pulleys, all or any of which have surface contours and shapes and constructions different from that possessed by a crown pulley and that the shapes of the faces of these pulleys will be retained because of the arrangement of a multiplicity of elements composing each pulley and because of the special constitution of each element to meet the wear to which-it is subjected. I

It is also to be understood that although certain types of compressed composite lumher and a certain arrangement thereof in a pulley have been specified, other materials, such as compressed paper, leather, fabric, etc, and other arrangements may be employed to carry out my invention and are to be considered within the scope of the appended claims.

I claim: V 1. .A crown pulley constituted of compressed compositelumber comprising a plurality of elements of such compressed element constituting the central portion of the pulley and the lesser comluinber, the most pressed elements constituting the outer portions of the pulley.

2. A power-transmitting device including an axis about which the device is adapted to rotate, said device having a face with a predetermined contour presenting a continuous contact surface to the element through which driving pressure is transmitted, and adapted to be subjected to different degrees of driving pressure on different parts of the continuous contact surface of said face and harder at those parts of said continuous contact surface subjected to the greatest driving pressure while less hard at the other portions of the said continuous drive-afiected surface of said device.

3. A power-transmitting pulley having a face with a predetermined contour which is subjected to difierent degrees of driving pressure on differentparts of the face thereof which comprises a multiplicity of sets of powentransmitting laminae having different degrees of hardness and firmly united and secured together to present a substantially continuous driving face, the sets having the greatest hardness constituting the portion of the pulley subjected to the greatest driving pressure and the sets having lesser hardness constituting the other portions whereby the original predetermined contour of the face of the pulley is substantially maintained and preserved as the pulley wears away.

lntestimony. whereof I have hereunto set my hanc i l LAXVRENCE J. OLLESHEIMER. 

